refactor(nvim): finish restructuring lua files

This completes what I started in commit
0786ed3b3d, refactoring the lua code by
restructuring the directories and removing the `init` functions at the
bottom of each file.

nvim/.config/nvim/init.lua

@@ -1 +1,3 @@
-require 'opdavies'.init()
+require "opdavies.vim"
+
+require "opdavies.packer"

nvim/.config/nvim/lua/opdavies/init.lua

@@ -1,8 +0,0 @@
-local function init()
-  require 'opdavies.vim'.init()
-  require 'opdavies.packer'.init()
-end
-
-return {
-  init = init
-}

nvim/.config/nvim/lua/opdavies/packer.lua

@@ -1,4 +1,3 @@
-local function packer_startup()
 require('packer').startup(function()
   use 'wbthomason/packer.nvim'
 
@@ -67,12 +66,3 @@ local function packer_startup()
 
   use 'vimwiki/vimwiki'
 end)
-end
-
-local function init()
-  packer_startup()
-end
-
-return {
-  init = init
-}

nvim/.config/nvim/lua/opdavies/vim.lua

@@ -94,14 +94,12 @@ local function set_vim_o()
 end
 
 local function init()
+  set_vim_g()
+  set_vim_o()
+  set_key_mappings()
   set_autocmd()
   set_filetypes()
   set_highlights()
-  set_key_mappings()
-  set_vim_g()
-  set_vim_o()
 end
 
-return {
-  init = init
-}
+init()